Commit 69356712 authored by Joerg Roedel's avatar Joerg Roedel
Browse files

iommu: Add DOMAIN_ATTR_WINDOWS domain attribute 



This attribute can be used to set and get the number of
subwindows on IOMMUs that are window-based.

Signed-off-by: default avatarJoerg Roedel <joro@8bytes.org>
parent d7787d57

drivers/iommu/iommu.c

+30 −3
Original line number Diff line number Diff line
@@ -891,6 +891,7 @@ int iommu_domain_get_attr(struct iommu_domain *domain, 
	struct iommu_domain_geometry *geometry;

	bool *paging;

	int ret = 0;

	u32 *count;



	switch (attr) {

	case DOMAIN_ATTR_GEOMETRY:
@@ -901,6 +902,15 @@ int iommu_domain_get_attr(struct iommu_domain *domain, 
	case DOMAIN_ATTR_PAGING:

		paging  = data;

		*paging = (domain->ops->pgsize_bitmap != 0UL);

		break;

	case DOMAIN_ATTR_WINDOWS:

		count = data;



		if (domain->ops->domain_get_windows != NULL)

			*count = domain->ops->domain_get_windows(domain);

		else

			ret = -ENODEV;



		break;

	default:

		if (!domain->ops->domain_get_attr)
@@ -916,9 +926,26 @@ EXPORT_SYMBOL_GPL(iommu_domain_get_attr); 
int iommu_domain_set_attr(struct iommu_domain *domain,

			  enum iommu_attr attr, void *data)

{

	if (!domain->ops->domain_set_attr)

	int ret = 0;

	u32 *count;



	switch (attr) {

	case DOMAIN_ATTR_WINDOWS:

		count = data;



		if (domain->ops->domain_set_windows != NULL)

			ret = domain->ops->domain_set_windows(domain, *count);

		else

			ret = -ENODEV;



		break;

	default:

		if (domain->ops->domain_set_attr == NULL)

			return -EINVAL;



	return domain->ops->domain_set_attr(domain, attr, data);

		ret = domain->ops->domain_set_attr(domain, attr, data);

	}



	return ret;

}

EXPORT_SYMBOL_GPL(iommu_domain_set_attr);

include/linux/iommu.h

+5 −0
Original line number Diff line number Diff line
@@ -60,6 +60,7 @@ struct iommu_domain { 
enum iommu_attr {

	DOMAIN_ATTR_GEOMETRY,

	DOMAIN_ATTR_PAGING,

	DOMAIN_ATTR_WINDOWS,

	DOMAIN_ATTR_MAX,

};
@@ -106,6 +107,10 @@ struct iommu_ops { 
	int (*domain_window_enable)(struct iommu_domain *domain, u32 wnd_nr,

				    phys_addr_t paddr, u64 size);

	void (*domain_window_disable)(struct iommu_domain *domain, u32 wnd_nr);

	/* Set the numer of window per domain */

	int (*domain_set_windows)(struct iommu_domain *domain, u32 w_count);

	/* Get the numer of window per domain */

	u32 (*domain_get_windows)(struct iommu_domain *domain);



	unsigned long pgsize_bitmap;

};